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Potash doesn't refer to any particulat compound as such. It represents any potassium compound. In terms of fertilizers it include KCl, KNO3, K2SO4. I doubt that a potash fertilizer can include K2CO3.
Thanks. But what I have to find its systematic name for this compound, give its empirical formula and write down what type of compound is Potash.
Do I have to just pick any compound such as KCl or KNO3 and go ahead to give empirical formula and write what kind of compound it is?
As you can see, and like shankvee\ said, there is no one compound that the name represents. You may try looking in any other literature you have available that's related to the course -- the textbook, handouts, etc. -- to see if you can find any more specifics on the question.